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Method for preparing ceramsite from coal-based solid waste

A ceramsite and coal-based technology, which is applied in the field of preparing ceramsite by using coal-based solid waste, can solve the problems of high cost of additives, high calorific value of solid waste, and small amount of solid waste added, so as to avoid large environmental burden, Avoid over-temperature shrinkage and increase the effect of breathability

Pending Publication Date: 2022-05-13
北京蚯蚓科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, coal-based solid waste containing more fixed carbon, such as gasification slag, slag, and desulfurization ash, is usually used to prepare ceramsite. On the one hand, this part of solid waste has a high calorific value, and on the other hand, fixed carbon burns slowly. Products with high calorific value and high carbon content are difficult to completely react carbon, which may easily cause product black spots and unqualified performance. For this reason, an auxiliary combustion zone is required for decarbonization.
At the same time, most of these coal-based solid wastes are used as single solid wastes. However, these solid wastes usually exist near coal mining enterprises and need to be comprehensively utilized to avoid complex processes, small total amount of solid waste added, and high cost of admixtures. The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Classify two types of coal gangue, one is coal gangue with alumina content of 23.5%, containing clay mineral kaolin, and good plasticity; the other type of coal gangue has alumina content of 18.3%, does not contain clay minerals, is mainly quartz, and has good plasticity. poor. The two types of coal gangue are mixed according to the mass ratio of 3:7 to prepare all-solid waste ceramsite green balls, and the calorific value of ceramsite green balls is 750kcal / kg. To this end, the ceramsite raw meal balls are sent to dry, preheated to 500°C, and then enter the auxiliary combustion zone for decarburization. When the temperature rises to 550°C, an ignition spray gun is set to ignite, so that the ceramsite can burn; The temperature in the combustion zone is 500-1000°C, and the maximum temperature in the auxiliary combustion zone is controlled by ventilation to 900°C. The decarburization time is 45 minutes, and then the temperature is further raised to 1120°C for roasting, an...

Embodiment 2

[0028] Raw material 1 coal gangue has an alumina content of 21.90%, contains clay mineral kaolin, and has good plasticity; the other type of raw material is gasification slag, which has poor plasticity. The coal gangue and gasification slag are mixed according to the mass ratio of 7:3 to prepare all-solid waste ceramsite green balls, and the calorific value of the ceramsite green balls is 1020kcal / kg. To this end, the ceramsite raw meal balls are sent to dry, preheated to 500°C, and then enter the auxiliary combustion zone for decarburization. When the temperature rises to 600°C, an ignition spray gun is set to ignite, so that the ceramsite can burn; the ceramsite is in the auxiliary combustion zone The temperature in the zone is 500-1000°C, and the maximum temperature in the auxiliary combustion zone is controlled by ventilation to 950°C, the decarburization time is 60 minutes, and then the temperature is further raised to 1120°C for roasting, and then cooled to room temperatu...

Embodiment 3

[0030] The raw material coal gangue has an alumina content of 23.60%, contains clay mineral kaolin, and has good plasticity. The coal gangue is prepared into all-solid waste ceramsite green balls, and the calorific value of the ceramsite green balls is 320kcal / kg. To this end, the ceramsite raw meal balls are sent into the kiln, dried, preheated to 500°C, and then enter the auxiliary combustion zone for decarburization. The temperature of the ceramsite in the auxiliary combustion zone is 500-1000°C, and the decarburization time is 60 minutes; There is no need to set up an ignition spray gun point system in the auxiliary combustion area, and it is not necessary to control the maximum temperature in the auxiliary combustion area through ventilation; after decarburization, the ceramsite is further heated to 1120°C for roasting, and then cooled to room temperature to obtain the finished ceramsite. There is no black center inside the ceramsite, and the bulk density is 995.3Kg / m 3 ...

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Abstract

The invention discloses a method for preparing ceramsite by using coal-based solid waste, which comprises the following steps: classifying according to different plasticity of coal-based solid waste raw materials to obtain ceramsite raw materials; and after drying the ceramsite raw material, arranging an auxiliary combustion area in an interval of 800-1000 DEG C for decarburization, and roasting in an interval of 1000-1200 DEG C. The coal-based solid waste is efficiently utilized, an optimized roasting method is adopted, the full-solid waste ceramsite product is prepared, and the mechanical property of the product is excellent; and the process is simple, is suitable for industrial popularization and application, can be used as a building lightweight aggregate or a building gravel material, and has excellent environmental benefits, economic benefits and social benefits. The method is suitable for the field of coal-based solid waste utilization.

Description

technical field [0001] The invention belongs to the field of coal-based solid waste utilization, and in particular relates to a method for preparing ceramsite by utilizing coal-based solid waste. Background technique [0002] In the prior art, coal-based solid waste containing more fixed carbon, such as gasification slag, slag, and desulfurization ash, is usually used to prepare ceramsite. On the one hand, this part of solid waste has a high calorific value, and on the other hand, fixed carbon burns slowly. Products with high calorific value and high carbon content are difficult to completely react carbon, which may easily cause product black spots and unqualified performance. For this reason, an auxiliary combustion zone is required for the purpose of decarbonization. At the same time, most of these coal-based solid wastes are used as single solid wastes. However, these solid wastes usually exist near coal mining enterprises and need to be comprehensively utilized to avoid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B33/132C04B33/13
CPCC04B38/009C04B33/132C04B33/13C04B2235/6567C04B2235/77C04B2235/96C04B38/0067Y02P40/60
Inventor 李宇姚长青储英健徐顺涛
Owner 北京蚯蚓科技有限公司
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